US3819843A - Keyboard electronic music instrument with step-wise variable volume control responsive to key-touch - Google Patents

Keyboard electronic music instrument with step-wise variable volume control responsive to key-touch Download PDF

Info

Publication number
US3819843A
US3819843A US00359362A US35936273A US3819843A US 3819843 A US3819843 A US 3819843A US 00359362 A US00359362 A US 00359362A US 35936273 A US35936273 A US 35936273A US 3819843 A US3819843 A US 3819843A
Authority
US
United States
Prior art keywords
tone
tone signal
keyboard
key
coupled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00359362A
Other languages
English (en)
Inventor
S Okamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Application granted granted Critical
Publication of US3819843A publication Critical patent/US3819843A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
    • G10H1/04—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation
    • G10H1/053—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation during execution only
    • G10H1/055—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation during execution only by switches with variable impedance elements
    • G10H1/0555—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation during execution only by switches with variable impedance elements using magnetic or electromagnetic means

Definitions

  • ABSTRACT PP 359,362 A keyboard electronic musical instrument having a volume control arrangement responsive to each key- [301 Foreign Application Priority Data touch on the keyboard of the instrument, the volume 1 control arrangement comprising an analogue voltage May 11, 1972 Japan 47-46804 gfinerator for producing an analogue voltage in portion to the magnitude of a key depressing force, a
  • a keyboard musical instrument such as a piano
  • a prominent difference arises in the volumes of produced musical tones between when a key on the keyboard is strongly or quickly depressed and when a key is lightly or slowly depressed.
  • a conventional keyboard electronic musical instrument such as an electronic organ
  • when any key on the instrument keyboard is depressed it is only designed to cause a key switch associated therewith to be actuated and a tone signal from a tone signal generator associated therewith to be conducted tO a loudspeaker through the succeeding circuitry including tone coloring filters, an expression control and an amplifier, thereby to emanate from the loudspeaker a musical sound or tone having a desired tone color. That is, the volume of musical tones from such conventional instrument is controlled only by means of an expression control manipulated by a players foot.
  • tone volume control device such as the one shown in FIG. 1 which is so designed as to control, upon selective depression of a key, the volume of musical tones emanated from the instrument in response to the magnitude of the key depressing force or speed.
  • tone signals from tone signal generators 14 are respectively fed to corresponding tone level control keyers which are normally kept nonconductive, and when any of plural keys 11,, 11 ll juxtaposed on a keyboard 12 in the order of musical notes is depressed, the corresponding one of the key-touch responsive analogue voltage generators 17 generates an analogue voltage representing the force with which the key is depressed.
  • the analogue voltage thus obtained is supplied to the corresponding one of the tone level control keyers 15' so as to cause it to be made conductive.
  • tone signal generated by one of the tone signal generators 17 which corresponds to the depressed key is then conducted through the conducting tone level control keyer 15 to a line 16, its level being determined in response to the analogue voltage delivered from the key-touch responsive analogue voltage generator l7 constructed as hereinafter described.
  • a permanent magnet or magnetic material 21 and a coil 22 wound around a core 23 so arranged under the key 11 as to progressively approach (or level) each other as the key 11 is depressed for perfon'nance.
  • Various practical arrangements of the permanent magnet 21 and the coil 22 are detailed in the Us. Pat. No. 3,705,254 issued to Amano.
  • the coil 22 has the one end connected to the ground and the other end connected via a rectifier constructed, eg of a diode 24 of the indicated polarity to the control electrode or gate of a field eflect transistor Q constituting the aforesaid tone level control keyer 15.
  • the field effect transistor Q has its drain-source path or conduction channel connected between the line 16 and a tone signal generator 14 corresponding to the key 11.
  • the gate of the field effect transistor Q is also con nected to ground via a capacitor C as well as a series circuit of a resistor R and a normally closed key switch 25 which is opened when the key 11 is operated.
  • the key-touch responsive analogue voltage generator 17 constructed as mentioned above act to induce across the coil 22 and electromotive force or a pulsating voltage whose level varies with the rate of changes with time in the amount of a magnetic flux penetrating the coil 22, namely, the
  • the pulsating voltage thus obtained is rectified by the diode rectifier 24 and is then charged in the capacitor C.
  • the voltage charged in the capacitor C is applied to the gate of the field effect transistor Q so as to vary an internal resistance prevailing across its drain and source.
  • the resultant tone signal appearing at the line 16 is finally emanated through the succeeding circuits including a tone coloring filters 18,.an expression control 13 and an amplifier 19 from a loudspeaker 20 as a musical tone bearing a desired color and having its volume controlled in accordance with the magnitude of the key depressing force.
  • the prior art keyboard electronic musical instrument of the above-mentioned construction has the drawback that the volume of its musical tones minutely varies to an extent indistinguishable by a player other than .a well-skilled player, because the volume change takes place in a Continuous analogue manner in the form of curve A, B or C shown in FIG. 3 in accordance with the magnitude of a key depressing force or speed.
  • digital means stepwise discontinuity of values, and not digital numerical representation of values.
  • the keyboard electronic musical instrument is characterized in that it is designed to provide akey-touch responsive volume control arrangement comprising a key-touch responsive analogue voltage generator producing, upon selective depression of any key on the instrument keyboard, an analogue voltage in proportion to the magnitude of the key depressing force; a stepwise converter coupled with the analogue voltage generator and producing one of a plurality of different digital voltages stepwisely responsive to'the analogue voltage; and a tone level control circuit coupled with the stepwise converter and with a tonesignal generator which generates a tone signal of a predetermined pitch so as to vary the level of the tone signal generated by the tone signal generator in response to that of the digital voltage derived from the stepwise converter.
  • the keyboard electronic musical instrument with the key-touch responsive volume control thus arranged has the advantage that it is particularly suitable for a beginner, because the volume of musical tones emanated from the instrument varies stepwise in a discontinuous digital manner with the magnitude of the force or speed at which any key on the instrument keyboard is depressed.
  • FIG. I is a schematic block circuit diagram of a prior art keyboard electronic musical instrument
  • FIG. 2 is a practical circuit arrangement of the keytouch responsive analogue voltage generator shown in FIG. 1;
  • FIG. 3 is a curve diagram illustrating the relationship of a key depressing force versus a tone level for the instrument shown in FIG. 1;
  • FIG. 4 is a schematic block circuit diagram of a keyboard electronic musical instrument in accordance with the invention.
  • FIG. 5 is a curve diagram illustrating the relationship of a key depressing force versus a tone level for the instrument in accordance with the invention
  • FIG. 6 is a practical arrangement of the stepwise converter and the tone level control keyer shown in FIG. 4;
  • FIGS. 7 and 8 are different practical arrangements of the stepwise converter and the tone level control keyer shown in FIG. 4.
  • FIG. 3 shows a schematic block circuit diagram of a keyboard electronic musical instrument embodying the invention.
  • a keyboard electronic musical instrument heretofore put to practical application such as an electronic organ is generally designed to emanate musical tones of a desired tone color by conducting a tone signal of a predetermined pitch generated from one tone signal generator 34 associated with the depressed key to a loudspeaker 37 through the succeeding circuits including tone coloring filters 35, an expression control 33 and an amplifier 36.
  • the keyboard electronic musical instrument of this invention is characterized in that there is further provided a key-touch responsive volume control arrangement of the later described construction which is adapted to vary stepwise in a discontinuous digitalmanner the level of a tone signal derived from the tone signal generator 34, namely, the volume of musical tones emanated from the instrument in response to the magnitude of the force with which any key on the keyboard 32 is depressed.
  • the key-touch responsive volume control arr-angement comprises key-touch responsive analogue voltage generators 41 each arranged as illustrated in FIG. 2 and each generating an analogue voltage 51 as shown in FIG. 5 with its voltage level controlled in proportion to the magnitude of the key depressing force when any key on the keyboard'32 is depressed; stepwise converters 42 coupled with the analogue voltage generators 41 and each producing a digital voltage stepwisely in response to the analogue voltage delivered from the keytouch responsive analogue voltage generators 41; and tone level control keyers 43 coupled with the tone signal generators 34 and with the stepwise converters 42 so as to stepwisely vary the level of a tone signal generated by one of the tone signal generators 34 which corresponds to the depressed key in response to one of different digital voltage levels L L L and L as shown in FIG. 5 which is delivered from the stepwise converters 42;
  • FIG. 6 is a practical arrangement of the stepwise converters 42 and the tone level control keyers 43 shown in FIG. 4.
  • the stepwise converters 42 each comprise a plurality of, e.g. four threshold circuits (Schmitt circuits) 61, 62, 63 and 64 having their inputs connected jointly to the output of the corresponding one of the analogue voltage generators 41 and biased at different threshold levels.
  • threshold circuits Schott circuits
  • the first threshold circuit 61 is designed to be made conductive and produce an output when an analogue voltage supplied thereto from the corresponding analogue voltage generator 41 exceeds a first lowest level; the second threshold circuit 62 is rendered conductive when the analogue voltage rises above a higher second level than the first level; the third threshold circuit 63 is brought to a conducting state when the analogue voltage increses over a higher third level than the second level; and the fourth threshold circuit 64 is set at a conducting state when the analogue voltage reaches a highest fourth level exceeding the third level.
  • the tone level control keyers 43 each comprise four normally open-circuit or nonconducting type field effect transistors Q1, Q2, Q3 and 04 having their gates separately connected to the corresponding outputs of the threshold circuits 61 to 64.
  • the sources (or drains) of the field effect transistors O1 to Q4 are jointly connected to the tone generators 34 and the drains (or courses) thereof are connected via the corresponding resistors R1, R2, R3 and R4 jointly to the tone coloring filter 35.
  • the first and second threshold circuits 61 and 62 are made simultaneously conductive so as to bring the first and second field effect transistors 01 and O2 to an operative state, thereby giving out a tone signal at the second voltage level L2.
  • the first to third threshold circuits 61 to 63 are simultaneously fired so as to cause the first to third field effect transistors O1 to O3 to be rendered conductive, thereby producing a tone signal having the third voltage level L3.
  • a wide variety of volume changes can be attained by suitably selecting the threshold levels of the threshold circuits 61 to 64 and/or the resistances of the resistors R1 to R4 included in the tone level control keyer 43.
  • FIG. 7 shows one modification of FIG. 6 where the four field effect transistors 01 to Q4 and resistors Rl to R4 constituting the tone level control keyer 43 are respectively replaced by a single bipolar transistor Q11 and a single resistor R1].
  • the transistor Oil has its base connected in common to the outputs of the threshold circuits 6] to 64 and its emitter-collector path or current conduction path connected via the resistor Rll between the tone generators 34 and the tone coloring filters 35.
  • FIG. 8 is a further modification of FIG. 7 where the threshold circuits 61 to 64 collectively constituting the stepwise converter 42 are replaced by an analogue-todigital converter 71.
  • FIGS. 7 and 8 can be operated in the same manner, and display the same effect, as the aforesaid embodiment.
  • a keyboard electronic musical instrument comprising a keyboard including a plurality of keys arranged side by side, tone signal generators each generating a tone signal of a predetermined pitch, and a sound reproducing system coupled to said tone signal generators, the sound reproducing system including tone coloring filters receiving the tone signals and a loudspeaker means coupled to the tone coloring filters for delivering the tone signal generated by said tone signal generators as a musical tone with a desired tone color,
  • a volume control arrangement which comprises:
  • a key-touch responsive analogue voltage generator coupled to said keyboard and producing an analogue voltage in proportion to the magnitude of the force with which any of said plurality of keys constituting said keyboard is selectively depressed;
  • a stepwise converter coupled to said analogue voltage generator and producing an output signal 6 which is stepwisely responsive to said analogue voltage generated thereby; and a tone level control circuit coupled to said stepwise converter and to said tone signal generators to vary the steady state level of the tone signal generated by said tone signal generators in accordance with the level of the output derived from said stepwise converter.
  • a keyboard electronic musical instrument as claimed in claim 1 wherein said stepwise converter comprises a plurality of threshold circuits having their inputs connected jointly to the output of said analogue voltage generator and biased at different threshold levels; and said tone level control circuit comprises a plurality of active circuit elements having their control electrodes connected separately to the outputs of said threshold circuits and their current conduction paths jointly coupled through individual resistors between said tone signal generators and said sound reproducing system.
  • a keyboard electronic musical instrument as claimed in claim 1 wherein said stepwise converter comprises a plurality of threshold circuits having their inputs connected jointly to the output of said analogue voltage generator and biased at different threshold levels; and said tone level control circuit comprises an active circuit element having its control electrode connected in common to the outputs of said threshold circuits and its current conduction path coupled between said tone signal generators and said sound reproducing system.
  • a keyboard electronic musical instrument as claimed in claim 1 wherein said stepwise converter comprises an analogue-to-digital converter having its input coupled with the output of said analogue voltage generator, and said tone level control circuit comprises an active circuit element having its control electrode coupled to the output of said analogue-to-digital converter and its current conduction path coupled between said tone signal generators and said sound reproducing system.
  • a keyboard electronic musical instrument as claimed in claim 1 wherein said tone level control circuit is coupled to the output of said stepwise converter and is coupled between the output of said tone signal generators and said sound reproducing system.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
US00359362A 1972-05-11 1973-05-11 Keyboard electronic music instrument with step-wise variable volume control responsive to key-touch Expired - Lifetime US3819843A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47046804A JPS5121566B2 (enrdf_load_stackoverflow) 1972-05-11 1972-05-11

Publications (1)

Publication Number Publication Date
US3819843A true US3819843A (en) 1974-06-25

Family

ID=12757503

Family Applications (1)

Application Number Title Priority Date Filing Date
US00359362A Expired - Lifetime US3819843A (en) 1972-05-11 1973-05-11 Keyboard electronic music instrument with step-wise variable volume control responsive to key-touch

Country Status (2)

Country Link
US (1) US3819843A (enrdf_load_stackoverflow)
JP (1) JPS5121566B2 (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881387A (en) * 1973-02-19 1975-05-06 Nippon Musical Instruments Mfg Electronic musical instrument with effect control dependent on expression and keyboard manipulation
US3886834A (en) * 1973-05-11 1975-06-03 Nippon Musical Instruments Mfg Electronic musical instrument capable of modulation controlling a second keyboard section tone signal in accordance with a first keyboard section tone signal
US3949639A (en) * 1974-01-10 1976-04-13 Nippon Gakki Seizo Kabushiki Kaisha Voltage controlled type electronic musical instrument
US3952624A (en) * 1973-11-02 1976-04-27 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument capable of generating tone signals having pitch frequency, tone color and volume envelope varied with time
US3965789A (en) * 1974-02-01 1976-06-29 Arp Instruments, Inc. Electronic musical instrument effects control
US4195545A (en) * 1977-02-18 1980-04-01 Nippon Gakki Seizo Kabushiki Kaisha Digital touch response circuit of electronic musical instrument
US4231276A (en) * 1977-09-05 1980-11-04 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument of waveshape memory type
FR2500670A1 (fr) * 1981-02-25 1982-08-27 Walter Muller Appareil de maniement equipant un instrument de musique electronique muni d'au moins un synthetiseur
US4510836A (en) * 1983-12-01 1985-04-16 Allen Organ Company Touch sensitivity in an electronic musical instrument having non-positive attack
EP0140008A1 (en) * 1983-09-02 1985-05-08 Yamaha Corporation Musical tone producing device of waveshape memory readout type
US4552051A (en) * 1982-11-02 1985-11-12 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument with key touch detector and operator member
EP0259488A4 (en) * 1986-03-18 1989-11-07 Fiori David KEYBOARD FOR MUSICAL INSTRUMENT.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5744143U (enrdf_load_stackoverflow) * 1980-08-22 1982-03-11
JPS6154881A (ja) * 1984-08-23 1986-03-19 Denki Onkyo Co Ltd 高圧発生装置

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US27015A (en) * 1860-01-31 Loken j
US3534144A (en) * 1969-01-02 1970-10-13 Hammond Corp Keyer-synthesizer for an electronic musical instrument employing an integrated circuit
US3571481A (en) * 1968-01-18 1971-03-16 Nippon Musical Instruments Mfg Marimba tone forming system for an electronic musical instrument
US3582530A (en) * 1970-03-11 1971-06-01 Nippon Musical Instruments Mfg Electronic musical instrument producing percussion signals by additive mixing of component signals
US3626076A (en) * 1969-05-21 1971-12-07 Nippon Musical Instruments Mfg Mixer circuit for electronic musical instrument providing staircase tone signal
US3626074A (en) * 1969-06-24 1971-12-07 Nippon Musical Instruments Mfg Touch-responsive tone envelope control circuit for electronic musical instruments
US3626075A (en) * 1969-07-12 1971-12-07 Nippon Musical Instruments Mfg Touch-responsive tone envelope control circuit for electronic musical instruments
US3636232A (en) * 1969-07-04 1972-01-18 Nippon Musical Instruments Mfg Touch-responsive tone envelope control circuit for electronic musical instruments
US3651730A (en) * 1969-09-10 1972-03-28 Nippon Musical Instruments Mfg Sound level control device in electronic musical instrument employing touch responsive keying means
US3697662A (en) * 1969-12-18 1972-10-10 Nippon Musical Instruments Mfg Keying system capable of producing piano-tone effects for use in electronic musical instruments
US3715445A (en) * 1971-04-30 1973-02-06 Chicago Musical Instr Co Musical instrument having dc-keying circuit

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US27015A (en) * 1860-01-31 Loken j
US3571481A (en) * 1968-01-18 1971-03-16 Nippon Musical Instruments Mfg Marimba tone forming system for an electronic musical instrument
US3534144A (en) * 1969-01-02 1970-10-13 Hammond Corp Keyer-synthesizer for an electronic musical instrument employing an integrated circuit
US3626076A (en) * 1969-05-21 1971-12-07 Nippon Musical Instruments Mfg Mixer circuit for electronic musical instrument providing staircase tone signal
US3626074A (en) * 1969-06-24 1971-12-07 Nippon Musical Instruments Mfg Touch-responsive tone envelope control circuit for electronic musical instruments
US3636232A (en) * 1969-07-04 1972-01-18 Nippon Musical Instruments Mfg Touch-responsive tone envelope control circuit for electronic musical instruments
US3626075A (en) * 1969-07-12 1971-12-07 Nippon Musical Instruments Mfg Touch-responsive tone envelope control circuit for electronic musical instruments
US3651730A (en) * 1969-09-10 1972-03-28 Nippon Musical Instruments Mfg Sound level control device in electronic musical instrument employing touch responsive keying means
US3697662A (en) * 1969-12-18 1972-10-10 Nippon Musical Instruments Mfg Keying system capable of producing piano-tone effects for use in electronic musical instruments
US3582530A (en) * 1970-03-11 1971-06-01 Nippon Musical Instruments Mfg Electronic musical instrument producing percussion signals by additive mixing of component signals
US3715445A (en) * 1971-04-30 1973-02-06 Chicago Musical Instr Co Musical instrument having dc-keying circuit

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881387A (en) * 1973-02-19 1975-05-06 Nippon Musical Instruments Mfg Electronic musical instrument with effect control dependent on expression and keyboard manipulation
US3886834A (en) * 1973-05-11 1975-06-03 Nippon Musical Instruments Mfg Electronic musical instrument capable of modulation controlling a second keyboard section tone signal in accordance with a first keyboard section tone signal
US3952624A (en) * 1973-11-02 1976-04-27 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument capable of generating tone signals having pitch frequency, tone color and volume envelope varied with time
US3949639A (en) * 1974-01-10 1976-04-13 Nippon Gakki Seizo Kabushiki Kaisha Voltage controlled type electronic musical instrument
US3965789A (en) * 1974-02-01 1976-06-29 Arp Instruments, Inc. Electronic musical instrument effects control
US4195545A (en) * 1977-02-18 1980-04-01 Nippon Gakki Seizo Kabushiki Kaisha Digital touch response circuit of electronic musical instrument
US4231276A (en) * 1977-09-05 1980-11-04 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument of waveshape memory type
FR2500670A1 (fr) * 1981-02-25 1982-08-27 Walter Muller Appareil de maniement equipant un instrument de musique electronique muni d'au moins un synthetiseur
US4552051A (en) * 1982-11-02 1985-11-12 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument with key touch detector and operator member
EP0140008A1 (en) * 1983-09-02 1985-05-08 Yamaha Corporation Musical tone producing device of waveshape memory readout type
US4510836A (en) * 1983-12-01 1985-04-16 Allen Organ Company Touch sensitivity in an electronic musical instrument having non-positive attack
EP0259488A4 (en) * 1986-03-18 1989-11-07 Fiori David KEYBOARD FOR MUSICAL INSTRUMENT.

Also Published As

Publication number Publication date
JPS5121566B2 (enrdf_load_stackoverflow) 1976-07-03
JPS498211A (enrdf_load_stackoverflow) 1974-01-24

Similar Documents

Publication Publication Date Title
US3819843A (en) Keyboard electronic music instrument with step-wise variable volume control responsive to key-touch
US4339979A (en) Electronic music instrument
US3854365A (en) Electronic musical instruments reading memorized waveforms for tone generation and tone control
US3546355A (en) Automatic tone generating system for an electronic organ
CA1040904A (en) Electronic piano circuit
US3617602A (en) Musical instrument having automatic arpeggio circuitry
HK88389A (en) Tone information processing device for an electronic musical instrument
US4010667A (en) Rhythm unit with programmed envelope waveform, amplitude, and the like
US3861263A (en) Variable time constant circuit for use in an electronic musical instrument
US3619469A (en) Electronic musical instrument with key and pedal-operated volume controls
US3213180A (en) Tone generation system
US3786166A (en) Keyboard type electronic musical instrument
US3499092A (en) Accompaniment chord rhythm system
US3333042A (en) Electronic organ with chiff
US3842182A (en) Arpeggio system
US3626074A (en) Touch-responsive tone envelope control circuit for electronic musical instruments
US4205582A (en) Percussion envelope generator
US3697664A (en) Electronic musical instrument having automatic bass tone selector
US3749807A (en) Orchestral effect producing system for an electronic musical instrument
US3470306A (en) Bass register keying system
US3941024A (en) Electrical musical instrument with automatic sequential tone generation
US4236437A (en) Organ brass pulse keyer
US3636232A (en) Touch-responsive tone envelope control circuit for electronic musical instruments
US3806624A (en) Discovery in keying circuit for a musical instrument
USRE26533E (en) Tone generation system